Network Control should provide for a "What's On" live TV feature of a remote control.

Description

I propose and have implemented adding functionality to the Network Control telnet interface to allow a remote control developer (me for instance) to put up a table of what programs are now available to the LiveTV mode. This would involve adding 3 queries:

query liveTV - List current TV schedule
query liveTV CHANID - Query current program for specified channel
query time - Query current time on server

(In [15396]) Add "query liveTV", "query liveTV CHANID", and "query time" commands to
the NetworkControl? interface in mythfrontend. The "query liveTV" commands
return a list of what programs are currently airing. The "query time" command
returns the current time on the frontend in ISODate format.